byOptical: Pal.Obs. DSS; X-ray: NASA/CXC/Columbia U./C.Scharf et al.
MPEG This sequence begins with a wide-field, visible light view (yellow) of the Fornax galaxy cluster. Next, it zooms into the region Chandra observed in X-rays (blue). Scientists think the core of the cluster, labeled as NGC 1399, is moving to the lower right on a collision course with another group of galaxies seen only in the optical data. This indicates that the cluster lies along a large, unseen, filamentary structure composed mostly of dark matter that is pulling everything toward it. Two... Topics: What -- Visible Light, What -- Fornax, Where -- NGC 1 Source: http://chandra.harvard.edu/photo/2004/fornax/animations.html